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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of BNO'S Securities (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Short-Term Investments | $ 164,347,000 | $ 30,347,000
Exchange-Traded Futures Contracts |  |
Foreign Contracts | 13,465,360 | 2,196,530
Fair Value, Inputs, Level 1 [Member] |  |
Short-Term Investments | 164,347,000 | 30,347,000
Exchange-Traded Futures Contracts |  |
Foreign Contracts | 13,465,360 | 2,196,530
Fair Value, Inputs, Level 2 [Member] |  |
Short-Term Investments | 0 | 0
Exchange-Traded Futures Contracts |  |
Foreign Contracts | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Short-Term Investments | 0 | 0
Exchange-Traded Futures Contracts |  |
Foreign Contracts | $ 0 | $ 0

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